include/linux/hugetlb.h

   1 #ifndef _LINUX_HUGETLB_H
   2 #define _LINUX_HUGETLB_H
   3
   4 #include <linux/mm_types.h>
   5 #include <linux/fs.h>
   6 #include <linux/hugetlb_inline.h>
   7 #include <linux/cgroup.h>
   8
   9 struct ctl_table;
  10 struct user_struct;
  11 struct mmu_gather;
  12
  13 #ifdef CONFIG_HUGETLB_PAGE
  14
  15 #include <linux/mempolicy.h>
  16 #include <linux/shm.h>
  17 #include <asm/tlbflush.h>
  18
  19 struct hugepage_subpool {
  20         spinlock_t lock;
  21         long count;
  22         long max_hpages, used_hpages;
  23 };
  24
  25 extern spinlock_t hugetlb_lock;
  26 extern int hugetlb_max_hstate __read_mostly;
  27 #define for_each_hstate(h) \
  28         for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
  29
  30 struct hugepage_subpool *hugepage_new_subpool(long nr_blocks);
  31 void hugepage_put_subpool(struct hugepage_subpool *spool);
  32
  33 int PageHuge(struct page *page);
  34
  35 void reset_vma_resv_huge_pages(struct vm_area_struct *vma);
  36 int hugetlb_sysctl_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  37 int hugetlb_overcommit_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  38 int hugetlb_treat_movable_handler(struct ctl_table *, int, void __user *, size_t *, loff_t *);
  39
  40 #ifdef CONFIG_NUMA
  41 int hugetlb_mempolicy_sysctl_handler(struct ctl_table *, int,
  42                                         void __user *, size_t *, loff_t *);
  43 #endif
  44
  45 int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *);
  46 long follow_hugetlb_page(struct mm_struct *, struct vm_area_struct *,
  47                          struct page **, struct vm_area_struct **,
  48                          unsigned long *, unsigned long *, long, unsigned int);
  49 void unmap_hugepage_range(struct vm_area_struct *,
  50                           unsigned long, unsigned long, struct page *);
  51 void __unmap_hugepage_range_final(struct mmu_gather *tlb,
  52                           struct vm_area_struct *vma,
  53                           unsigned long start, unsigned long end,
  54                           struct page *ref_page);
  55 void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma,
  56                                 unsigned long start, unsigned long end,
  57                                 struct page *ref_page);
  58 int hugetlb_prefault(struct address_space *, struct vm_area_struct *);
  59 void hugetlb_report_meminfo(struct seq_file *);
  60 int hugetlb_report_node_meminfo(int, char *);
  61 void hugetlb_show_meminfo(void);
  62 unsigned long hugetlb_total_pages(void);
  63 int hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma,
  64                         unsigned long address, unsigned int flags);
  65 int hugetlb_reserve_pages(struct inode *inode, long from, long to,
  66                                                 struct vm_area_struct *vma,
  67                                                 vm_flags_t vm_flags);
  68 void hugetlb_unreserve_pages(struct inode *inode, long offset, long freed);
  69 int dequeue_hwpoisoned_huge_page(struct page *page);
  70 void copy_huge_page(struct page *dst, struct page *src);
  71
  72 extern unsigned long hugepages_treat_as_movable;
  73 extern const unsigned long hugetlb_zero, hugetlb_infinity;
  74 extern int sysctl_hugetlb_shm_group;
  75 extern struct list_head huge_boot_pages;
  76
  77 /* arch callbacks */
  78
  79 pte_t *huge_pte_alloc(struct mm_struct *mm,
  80                         unsigned long addr, unsigned long sz);
  81 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr);
  82 int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep);
  83 struct page *follow_huge_addr(struct mm_struct *mm, unsigned long address,
  84                               int write);
  85 struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
  86                                 pmd_t *pmd, int write);
  87 struct page *follow_huge_pud(struct mm_struct *mm, unsigned long address,
  88                                 pud_t *pud, int write);
  89 int pmd_huge(pmd_t pmd);
  90 int pud_huge(pud_t pmd);
  91 unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
  92                 unsigned long address, unsigned long end, pgprot_t newprot);
  93
  94 #else /* !CONFIG_HUGETLB_PAGE */
  95
  96 static inline int PageHuge(struct page *page)
  97 {
  98         return 0;
  99 }
 100
 101 static inline void reset_vma_resv_huge_pages(struct vm_area_struct *vma)
 102 {
 103 }
 104
 105 static inline unsigned long hugetlb_total_pages(void)
 106 {
 107         return 0;
 108 }
 109
 110 #define follow_hugetlb_page(m,v,p,vs,a,b,i,w)   ({ BUG(); 0; })
 111 #define follow_huge_addr(mm, addr, write)       ERR_PTR(-EINVAL)
 112 #define copy_hugetlb_page_range(src, dst, vma)  ({ BUG(); 0; })
 113 #define hugetlb_prefault(mapping, vma)          ({ BUG(); 0; })
 114 static inline void hugetlb_report_meminfo(struct seq_file *m)
 115 {
 116 }
 117 #define hugetlb_report_node_meminfo(n, buf)     0
 118 static inline void hugetlb_show_meminfo(void)
 119 {
 120 }
 121 #define follow_huge_pmd(mm, addr, pmd, write)   NULL
 122 #define follow_huge_pud(mm, addr, pud, write)   NULL
 123 #define prepare_hugepage_range(file, addr, len) (-EINVAL)
 124 #define pmd_huge(x)     0
 125 #define pud_huge(x)     0
 126 #define is_hugepage_only_range(mm, addr, len)   0
 127 #define hugetlb_free_pgd_range(tlb, addr, end, floor, ceiling) ({BUG(); 0; })
 128 #define hugetlb_fault(mm, vma, addr, flags)     ({ BUG(); 0; })
 129 #define huge_pte_offset(mm, address)    0
 130 static inline int dequeue_hwpoisoned_huge_page(struct page *page)
 131 {
 132         return 0;
 133 }
 134
 135 static inline void copy_huge_page(struct page *dst, struct page *src)
 136 {
 137 }
 138
 139 static inline unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
 140                 unsigned long address, unsigned long end, pgprot_t newprot)
 141 {
 142         return 0;
 143 }
 144
 145 static inline void __unmap_hugepage_range_final(struct mmu_gather *tlb,
 146                         struct vm_area_struct *vma, unsigned long start,
 147                         unsigned long end, struct page *ref_page)
 148 {
 149         BUG();
 150 }
 151
 152 static inline void __unmap_hugepage_range(struct mmu_gather *tlb,
 153                         struct vm_area_struct *vma, unsigned long start,
 154                         unsigned long end, struct page *ref_page)
 155 {
 156         BUG();
 157 }
 158
 159 #endif /* !CONFIG_HUGETLB_PAGE */
 160
 161 #define HUGETLB_ANON_FILE "anon_hugepage"
 162
 163 enum {
 164         /*
 165          * The file will be used as an shm file so shmfs accounting rules
 166          * apply
 167          */
 168         HUGETLB_SHMFS_INODE     = 1,
 169         /*
 170          * The file is being created on the internal vfs mount and shmfs
 171          * accounting rules do not apply
 172          */
 173         HUGETLB_ANONHUGE_INODE  = 2,
 174 };
 175
 176 #ifdef CONFIG_HUGETLBFS
 177 struct hugetlbfs_sb_info {
 178         long    max_inodes;   /* inodes allowed */
 179         long    free_inodes;  /* inodes free */
 180         spinlock_t      stat_lock;
 181         struct hstate *hstate;
 182         struct hugepage_subpool *spool;
 183 };
 184
 185 static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb)
 186 {
 187         return sb->s_fs_info;
 188 }
 189
 190 extern const struct file_operations hugetlbfs_file_operations;
 191 extern const struct vm_operations_struct hugetlb_vm_ops;
 192 struct file *hugetlb_file_setup(const char *name, size_t size, vm_flags_t acct,
 193                                 struct user_struct **user, int creat_flags,
 194                                 int page_size_log);
 195
 196 static inline int is_file_hugepages(struct file *file)
 197 {
 198         if (file->f_op == &hugetlbfs_file_operations)
 199                 return 1;
 200         if (is_file_shm_hugepages(file))
 201                 return 1;
 202
 203         return 0;
 204 }
 205
 206
 207 #else /* !CONFIG_HUGETLBFS */
 208
 209 #define is_file_hugepages(file)                 0
 210 static inline struct file *
 211 hugetlb_file_setup(const char *name, size_t size, vm_flags_t acctflag,
 212                 struct user_struct **user, int creat_flags,
 213                 int page_size_log)
 214 {
 215         return ERR_PTR(-ENOSYS);
 216 }
 217
 218 #endif /* !CONFIG_HUGETLBFS */
 219
 220 #ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
 221 unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
 222                                         unsigned long len, unsigned long pgoff,
 223                                         unsigned long flags);
 224 #endif /* HAVE_ARCH_HUGETLB_UNMAPPED_AREA */
 225
 226 #ifdef CONFIG_HUGETLB_PAGE
 227
 228 #define HSTATE_NAME_LEN 32
 229 /* Defines one hugetlb page size */
 230 struct hstate {
 231         int next_nid_to_alloc;
 232         int next_nid_to_free;
 233         unsigned int order;
 234         unsigned long mask;
 235         unsigned long max_huge_pages;
 236         unsigned long nr_huge_pages;
 237         unsigned long free_huge_pages;
 238         unsigned long resv_huge_pages;
 239         unsigned long surplus_huge_pages;
 240         unsigned long nr_overcommit_huge_pages;
 241         struct list_head hugepage_activelist;
 242         struct list_head hugepage_freelists[MAX_NUMNODES];
 243         unsigned int nr_huge_pages_node[MAX_NUMNODES];
 244         unsigned int free_huge_pages_node[MAX_NUMNODES];
 245         unsigned int surplus_huge_pages_node[MAX_NUMNODES];
 246 #ifdef CONFIG_CGROUP_HUGETLB
 247         /* cgroup control files */
 248         struct cftype cgroup_files[5];
 249 #endif
 250         char name[HSTATE_NAME_LEN];
 251 };
 252
 253 struct huge_bootmem_page {
 254         struct list_head list;
 255         struct hstate *hstate;
 256 #ifdef CONFIG_HIGHMEM
 257         phys_addr_t phys;
 258 #endif
 259 };
 260
 261 struct page *alloc_huge_page_node(struct hstate *h, int nid);
 262
 263 /* arch callback */
 264 int __init alloc_bootmem_huge_page(struct hstate *h);
 265
 266 void __init hugetlb_add_hstate(unsigned order);
 267 struct hstate *size_to_hstate(unsigned long size);
 268
 269 #ifndef HUGE_MAX_HSTATE
 270 #define HUGE_MAX_HSTATE 1
 271 #endif
 272
 273 extern struct hstate hstates[HUGE_MAX_HSTATE];
 274 extern unsigned int default_hstate_idx;
 275
 276 #define default_hstate (hstates[default_hstate_idx])
 277
 278 static inline struct hstate *hstate_inode(struct inode *i)
 279 {
 280         struct hugetlbfs_sb_info *hsb;
 281         hsb = HUGETLBFS_SB(i->i_sb);
 282         return hsb->hstate;
 283 }
 284
 285 static inline struct hstate *hstate_file(struct file *f)
 286 {
 287         return hstate_inode(file_inode(f));
 288 }
 289
 290 static inline struct hstate *hstate_sizelog(int page_size_log)
 291 {
 292         if (!page_size_log)
 293                 return &default_hstate;
 294         return size_to_hstate(1 << page_size_log);
 295 }
 296
 297 static inline struct hstate *hstate_vma(struct vm_area_struct *vma)
 298 {
 299         return hstate_file(vma->vm_file);
 300 }
 301
 302 static inline unsigned long huge_page_size(struct hstate *h)
 303 {
 304         return (unsigned long)PAGE_SIZE << h->order;
 305 }
 306
 307 extern unsigned long vma_kernel_pagesize(struct vm_area_struct *vma);
 308
 309 extern unsigned long vma_mmu_pagesize(struct vm_area_struct *vma);
 310
 311 static inline unsigned long huge_page_mask(struct hstate *h)
 312 {
 313         return h->mask;
 314 }
 315
 316 static inline unsigned int huge_page_order(struct hstate *h)
 317 {
 318         return h->order;
 319 }
 320
 321 static inline unsigned huge_page_shift(struct hstate *h)
 322 {
 323         return h->order + PAGE_SHIFT;
 324 }
 325
 326 static inline unsigned int pages_per_huge_page(struct hstate *h)
 327 {
 328         return 1 << h->order;
 329 }
 330
 331 static inline unsigned int blocks_per_huge_page(struct hstate *h)
 332 {
 333         return huge_page_size(h) / 512;
 334 }
 335
 336 #include <asm/hugetlb.h>
 337
 338 #ifndef arch_make_huge_pte
 339 static inline pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
 340                                        struct page *page, int writable)
 341 {
 342         return entry;
 343 }
 344 #endif
 345
 346 static inline struct hstate *page_hstate(struct page *page)
 347 {
 348         return size_to_hstate(PAGE_SIZE << compound_order(page));
 349 }
 350
 351 static inline unsigned hstate_index_to_shift(unsigned index)
 352 {
 353         return hstates[index].order + PAGE_SHIFT;
 354 }
 355
 356 static inline int hstate_index(struct hstate *h)
 357 {
 358         return h - hstates;
 359 }
 360
 361 #else   /* CONFIG_HUGETLB_PAGE */
 362 struct hstate {};
 363 #define alloc_huge_page_node(h, nid) NULL
 364 #define alloc_bootmem_huge_page(h) NULL
 365 #define hstate_file(f) NULL
 366 #define hstate_sizelog(s) NULL
 367 #define hstate_vma(v) NULL
 368 #define hstate_inode(i) NULL
 369 #define huge_page_size(h) PAGE_SIZE
 370 #define huge_page_mask(h) PAGE_MASK
 371 #define vma_kernel_pagesize(v) PAGE_SIZE
 372 #define vma_mmu_pagesize(v) PAGE_SIZE
 373 #define huge_page_order(h) 0
 374 #define huge_page_shift(h) PAGE_SHIFT
 375 static inline unsigned int pages_per_huge_page(struct hstate *h)
 376 {
 377         return 1;
 378 }
 379 #define hstate_index_to_shift(index) 0
 380 #define hstate_index(h) 0
 381 #endif  /* CONFIG_HUGETLB_PAGE */
 382
 383 #endif /* _LINUX_HUGETLB_H */